Drought assessment for the potential of precipitation enhancement in northern Greece

Dalezios, N. R.; Papazafiriou, Zafirios G.; Papamichail, Dimitris; Karacostas, T.

doi:10.1007/bf00867995

Cited by 23 publications

(17 citation statements)

References 5 publications

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“…In addition, indices that reflect the soil water balance, such as those considered in this study, do not properly model soil water (Akinremi et al, 1996), especially excess rainfall, and give too little regard to crop management and phenological drought sensitivities (Easterling et al, 1988). It is worth mentioning at this point that waterlogging in spring and summer owing to heavy rainstorms, which account for the greatest part of precipitation, can reduce wheat yields in Greece (Dalezios et al, 1991). …”

Section: Evaluation Of Drought Indices For Predicting Wheat Yieldmentioning

confidence: 92%

“…Table I shows a descriptive contrast between the temperature and precipitation regimes of the two stations. Representative values of the available water capacity (AWC), a location-dependent input parameter required by the program, were identified from published studies (Dalezios et al, 1991). The yields of non-irrigated common wheat and durum wheat for TS and durum wheat for AT during 1964-2001 were obtained from published reports (e.g.…”

Section: Datamentioning

confidence: 99%

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Drought index evaluation for assessing future wheat production in Greece

Mavromatis

2006

Intl Journal of Climatology

149

102

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Abstract:The main objectives of this study were (1) to evaluate the SPI, and three variations of the Palmer Drought Severity Index (PDSI) (the original PDSI (Orig-PDSI), a self-calibrated version (SC-PDSI) and a modified scheme employing Priestlay-Taylor's approach to compute potential evapotranspiration (PET) instead of Thornthwaite's method) and their respective moisture anomaly indices for assessing rainfed common wheat and durum wheat yield in two pilot crop regions in north and central Greece, and (2) to assess the vulnerability of wheat production to climate change, using the most appropriate drought index, with future scenarios provided by the Hadley Centre regional climate model HadRM3. The yield models that performed best at high-drought risk years (the Orig-PDSI index in the northern region and the SC-PDSI in the southern region, explaining 82.5 to 84.7% and 92% of the measured yield variability, respectively) were also the most effective at predicting the observed wheat yields when soil moisture was not an important yield-limiting factor. However, the strength of the relationship between the drought indices and the crop yields was much weaker. Improving the representation of PET in the PDSI algorithm did not improve the model's performance. The sensitivity of the two types of wheat to HadRM3 projections for the high-drought risk years differed dramatically between the two pilot districts, with extremely decreased yields of 3.14 tn ha −1 expected in the southern district and much smaller changes expected in the northern district (−4.6 vs +6.7% for durum wheat and common wheat, respectively). For the low-drought risk years, the yield models in the northern region predicted lower yields by 30 to 60 kg ha −1 . A positive yield response by 30 kg ha −1 was found for the southern district.

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Section: Evaluation Of Drought Indices For Predicting Wheat Yieldmentioning

confidence: 92%

Section: Datamentioning

confidence: 99%

Drought index evaluation for assessing future wheat production in Greece

Mavromatis

2006

Intl Journal of Climatology

149

102

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“…Furthermore, climate variability and change likely to cause the decrease of precipitation resulting in occurrence of drought periods, may negatively affect the water resources and harm agriculture in such regions. Specifically, the country of Greece belongs to a region in southeastern Europe in which the use of water resources is mandatory for agriculture (Dalezios et al, 1991). Thus droughts as climatic extremes are more critical for agriculture than the average conditions.…”

Section: Introductionmentioning

confidence: 99%

Severity-duration-frequency analysis of droughts and wet periods in Greece

Dalezios¹,

Λουκάς

Vasiliades

et al. 2000

Hydrological Sciences Journal

115

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There is an escalation in the frequency and severity of extreme events due to a number of environmental and/or anthropogenic factors. Droughts and exceptionally wet periods are regional phenomena, which are considered as major environmental extremes, especially in semiarid regions of the world, such as Greece. The development of severity-duration-frequency (SDF) relationships of droughts and wet periods over Greece is important in contemporary hydroclimatic and agroclimatic design and planning in the country. The Palmer Drought Severity Index (PDSI) is used for a quantitative description of droughts and wet periods. Statistical tests and visual inspection indicate that the EV1 (Gumbel) frequency distribution fits satisfactorily all the identified durations of droughts and wet periods, respectively. Moreover, the SDF curves show that decreasing frequencies (i.e. increasing recurrence intervals) correspond to increasing severities of droughts and wet periods, respectively. The developed SDF relationships are used to produce tables and isoseverity maps of Greece for each identified duration and all the selected return periods or frequencies, which constitute an essential aid for design purposes. The results of the study indicate that there is a decreasing pattern of the severities of droughts and wet periods from west to east and that, for similar durations and return periods, the wet spells are, in general, more extreme than droughts in Greece.Analyse sévérité-durée-fréquence des périodes sèches et humides en GrèceRésumé La fréquence et la sévérité des événements extrêmes dus à différents facteurs naturels ou/et anthropiques augmentent. Les sécheresses et les périodes exceptionnellement arrosées sont des phénomènes régionaux, considérés comme des phénomènes extrêmes de première importance, en particulier dans les régions semiarides comme la Grèce. L'établissement de relations sévérité-durée-fréquence (SDF) s'y révèle importante à l'heure actuelle pour la conception et la planification hydro et agroclimatique. L'indice de sévérité de sécheresse de Palmer (Palmer Drought Severity Index-PDSI) a été utilisé pour décrire quantitativement les périodes sèches et humides. Les tests statistiques et l'appréciation visuelle montrent que la distribution de Gumbel (Extreme Value 1-EV1) rend bien compte de l'ensemble des durées observées des périodes sèches et humides. Les courbes SDF montrent de plus que les événements les plus sévères sont ceux dont la fréquence est la plus faible (c'est à dire ceux dont la durée de retour est la plus longue). Les relations SDF établies ont été utilisées pour élaborer à l'échelle de la Grèce des tables et des cartes d'égale sévérité pour différentes durées et pour différentes durées de retour qui constituent un outil essentiel d'aide à la conception. Les résultats de cette étude indiquent qu'il existe, pour une même durée et une même durée de retour, une tendance à la décroissance de la sévérité d'ouest en est, et que les épisodes humides sont, en général, plus sévères que les épisod...

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“…Jones et al (1996) related atmospheric circulation with PSDI index and Szinell et al (1998) studied the drought in Hungary using PDSI index. Dalezios et al (1991) applied the PDSI index in the central and northern region of Greece, while Maheras (2000) studied the drought in the Mediterranean region by calculating the normalized monthly precipitation anomaly (Standardized Precipitation Anomalies, SPA). McKee et al (1993) developed the Standardized Precipitation Index -SPI, a drought index that identifies emerging droughts months sooner than the Palmer Index and it can be computed on various time scales.…”

Section: Introductionmentioning

confidence: 99%